是否变量声明意味着内存分配？ [英] Does variable declaration mean memory allocation?

问题描述

会不会是precise地说，在

Will it be precise to say that in

void f() {
    int x;
    ...
}

INT X; ？是指分配的sizeof（INT）在堆栈上字节

"int x;" means allocating sizeof(int) bytes on the stack?

是否有任何的规格是什么？

Are there any specifications for that?

推荐答案

在标准规定没有什么，有一个堆栈。并没有在一个局部变量需要分配给它的内存标准的任务。变量可以被放置在寄存器中，或甚至完全除去作为优化

Nothing in the standard mandates that there is a stack. And nothing in the standard mandates that a local variable needs memory allocated for it. The variable could be placed in a register, or even removed altogether as an optimization.

这篇关于是否变量声明意味着内存分配？的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！